export interface ConnectionPoolOptions {
    maxConnections?: number;
    keepAlive?: boolean;
    maxIdleTime?: number;
}
export declare class ConnectionPool {
    private readonly maxConnections;
    private readonly keepAlive;
    private readonly maxIdleTime;
    private connections;
    private cleanupInterval?;
    constructor(options?: ConnectionPoolOptions);
    acquire(host: string, timeout?: number): Promise<string>;
    release(connectionId: string): void;
    private waitForConnection;
    private cleanup;
    getStats(): {
        totalConnections: number;
        activeConnections: number;
        idleConnections: number;
        hosts: number;
    };
    destroy(): void;
}
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